Hamilton County Disaster Risk

Hamilton County has a FEMA National Risk Index rating of Relatively Moderate, placing it in the 93th percentile nationally out of 3,144 counties. This composite score reflects the county's overall exposure to natural hazards including floods, wildfires, tornadoes, earthquakes, and hurricanes, weighted by expected annual loss and social vulnerability.

Hamilton County is evaluated for five major natural hazard types: tornado (99th percentile), earthquake (96th percentile), flooding (95th percentile), wildfire (71th percentile), hurricane (63th percentile). The highest-risk hazard is tornado at the 99th percentile nationally. These scores are derived from FEMA's National Risk Index, which analyzes expected annual loss, social vulnerability, and community resilience for each hazard type.

Hamilton County's composite risk percentile is 93th, compared to the Tennessee state average of 53th percentile. The state's overall risk rating is Relatively Low. This means Hamilton County faces higher natural disaster risk than the typical county in Tennessee.

Yes, Hamilton County's tornado risk is at the 99th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Hamilton County is at the 95th percentile.

FEMA's National Risk Index (NRI) calculates risk scores for 18 natural hazard types across all U.S. counties and census tracts. The composite score combines Expected Annual Loss (estimated dollar losses from each hazard), Social Vulnerability (demographic factors affecting disaster impact), and Community Resilience (ability to recover). Percentile scores rank each county against all 3,144 U.S. counties, and risk ratings range from Very Low to Very High.

Hamilton County's composite risk score of 93th percentile is above the Tennessee state average of 53th percentile. This elevated risk is driven by tornado exposure (99th percentile), along with earthquake and flooding and wildfire and hurricane risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.